Improvement in machine foe geinding cuttees of mowing-machines



sliding upon the cross-bar G, substantially as and for the purpose set forth.

CHARLES .15. CURTIS, OF JORDAN, NEW YORK.

Letters Patent No. 82,808, dated October 6, 1868.

IMBROVEMBNT IN MACHINE IOR GRINDING GUTTERS OI MOWING-MAGHINES.

fitte Stimuli rtfrmt tu in` tigen tetten hdmi antmrtiugyrtt nf tirarme.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, CHARLES B. CURTIs, of Jordan, in the county of Onondaga, and State of New York, have invented a new and useful Improvement in Machines for Grinding'the Knives of Harvesters; and I do hereby declare that the following is a full, clear, and exact description of the sarna-reference being had to the annexed drawings, making part of-this specification, in which- Figure 1 is a perspective view.

Figure 2 is an elevation of part of the frame and one of the clutches, and

Figure 3 an elevation of part of the frame and one of the clamp-hooks.

The same letters, in all the figures, aroused to indicate the same parts.

My improvement relates to an adjustable frame, which may be attached to any ordinary grindstone-frame, for the purpose of conveniently supporting a harvester cutter-bar in such position that the knives may be ground as is required.

i In the annexed drawings, A is the bed-piece of the frame, having longitudinal slots a a, through which pass theclamp-hooks B B, which,- passing through washers C` resting lover the slots, are tightened by the thumb-nuts D'. The frame is intended to be secured diagonally across the corners of any ordinary grindstone-frame, by means of these clamps. I I

The part of the frame to which the cutters are fastened, osclillates upon the bed-piece A, the posts E E being attached-adjustably to such bed-piece by means of round boltsior pins F, passing through one of a'series of holes through the post, so that, as the grindstone becomes worn, from use, the frame-supporting the cutterbar may be lowered, and the knives be'thus maintained in contact with the stone.

The horizontal barG passes between the. posts, being fastened to them, forming a brace for the posts, and also supporting one of the clutches H, upon a sliding standard, I, fastened, by a strap, to the bar G, in such manner that it may be made easily to slide along the bar. This arrangement is necessary, for the purpose of grinding the end knives, the grindstone bcingpermauently fixed.

The cutter-bar is intended to be secured by three U-formed clutches H, which are attached to crank-rods, passing through the posts E E, at the-top, and also through the top of the standard I. The cutter-bar is fastened in the clamp by a thumb-screw.

As the several cranks are ofthe same length, and made to turn in the holes through which they are placed, when the nuts on their ends are loosened, the knives may be set at any required angle, and there securely held, by tightening the nuts.

This machine differs from all others in the mode of adjusting the frame and knives in relation to the stone, aud in the devices for securing the cutter-'bar at any required angle.

What I claim as my invention, and desire to secure by Letters Patent, isj 1. A frame, for supporting a cutter-bar upon the frame of an ordinary grindstonc, constructed with an adjustable slotted bedpiece,fA, and clamp-hooks B, and an oscillating support for the clutches, by which the putter-bar is secured, substantially as described.

2.l The combination ofthe bed-piece A, sol constructed that it may be adjustabl'y attached to the 'grindstoneframe, theside-pieces E, attached to the bed-piece, so as to-be vertically adjustable, and the clutches, for holding the cutter-har, substantially as described. j

3. The clutches H, attached to the frame by crank-rods, so arranged that the knives may be set at any required angle, substantially as set forth.

4. In combinationwith the end-clutches, an Aintermediate clutch,` attached to an adjustable standard, and

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

CHARLES B. CURTIS.

Witnesses:

JOHN S. HoLLINGsHEAD, Gnus. F. CLAUsnN. 

